Structural Assessment for Wall Removal

I need an assessment for a property modification. The project involves initially assessing the current roof structure and loads, after to confirm previous alterations are adequate and safe. then review whether our proposed changes can be implemented which includes removing a few first-floor walls in a detached house. There will also be some minor changes in the ground floor extension which may need a wall moved, so we need to understand which of these walls if any are load bearing and what is possible or not.

Requirements:
- A written opinion on whether the walls can be removed.
- Roof and floor load calculations for the proposed changes.
- Drawings or details for beams, supports, and connections.

I have:
- Photos and measurements of the walls, roof, and rooms.
- A recent survey or inspection report.

Ideal skills and experience:
- Structural engineering expertise.
- Experience with residential properties.
- Ability to provide detailed drawings and calculations.